New research by a UK team has provided a better understanding of the family history of melanoma.

In a report in the journal Nature Genetics, scientists from the Wellcome Trust Sanger Institute say they are closer to understanding the genetic reasons why some people have greater risk of melanoma due to family history.

The team found that people with a certain gene type had a higher risk of melanoma. These mutations deactivate the POT1 gene, which protects DNA chromosomes from damage, a step involved in the development of cancer.

The discovery will help identify who is most at risk in a family and who should be screened for melanoma.

While we know genes play a significant role in the development of skin cancer, only some are known. Having a better understanding of this gene will enable it to be detected in families and allow directed treatments.

Dr Safia Danovi, of Cancer Research UK, told BBC News "This is a step forward for people with a strong family history of melanoma, the most dangerous form of skin cancer. But it's important to remember that, for most of us, avoiding sunburn and sunbeds is the best way to reduce the risk of this disease."